A phylogenetic reconstruction of genus Pogostemon estimated using Baysean Inference of partial matK sequences generated in this study and obtained from GenBank. Node labels indicate posterior probabilities. Based on matK evidence, a well-supported clade containing P. guamensis, P. hirsutus, P. wightii, and P. mollis is separate from that containing P. cablin, the common patchouli plant with a broad feral distribution and superficial resemblance to P. guamensis. Arrow and highlighting indicate samples of P. guamensis.